By Matthew MacDonald, Bill Hamilton
Written via specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell offers every little thing .NET programmers might want to get a jump-start on ADO.NET know-how or to sharpen their abilities even additional. within the culture of O'Reilly's In a Nutshell sequence, ADO.NET in a Nutshell is the main entire and concise resource of ADO.NET info on hand. ADO.NET is the suite of knowledge entry applied sciences within the .NET Framework that builders use to construct purposes companies getting access to relational information and XML. Connecting to databases is a basic a part of such a lot functions, whether or not they are internet, WindowsÂR, disbursed, client/server, XML net prone, or anything totally assorted. yet ADO.NET is considerably diverse from Microsoft's past information entry applied sciences - together with the former model of ADO - so even skilled builders have to comprehend the fundamentals of the hot disconnected version earlier than they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell bargains one position to appear for those who need assistance with something with regards to this crucial expertise, together with a connection with the ADO.NET namespaces and item version. as well as being a helpful reference, this booklet presents a concise origin for programming with ADO.NET and covers quite a few matters that programmers face whilst constructing net functions or internet companies that depend on database entry. utilizing C#, this ebook offers actual international, sensible examples to help you placed ADO.NET to paintings instantly.
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Additional info for ADO.NET in a Nutshell
NET code. This saves you re-querying the database to find this information. The Northwind sample database doesn't use this technique; the database used by the IBuySpy e-commerce store does. com site or just refer to the following example. Here is the CustomerAdd stored procedure code in the store database: CREATE Procedure CustomerAdd ( @FullName nvarchar(50), @Email nvarchar(50), @Password nvarchar(50), @CustomerID int OUTPUT ) AS INSERT INTO Customers ( FullName, EMailAddress, Password ) VALUES ( @FullName, @Email, @Password ) SELECT @CustomerID = @@Identity GO This stored procedure defines three input parameter and one output parameter for the generated ID.
DataReaders In the previous chapter, you learned to execute simple nonquery commands to update the data source and retrieve calculated values. You can also use queries to fetch a set of rows from a data source in a single operation. NET, there are two ways to use query commands: with the disconnected DataSet object, as discussed in later chapters, and with the DataReader, which is the focus of this chapter. The DataReader is little more than a thin wrapper over a cursor that retrieves query results in a read-only, forward-only stream of information.
Figure 3-1 shows this situation. Figure 3-1. NET remoting. NET worker threads share a common pool of connections. With remoting, every component host shares a connection pool. Figure 3-2 diagrams this approach. Figure 3-2. NET Tutorial 39 web services or remoting. In fact, if you do, you could actually harm performance in a small-scale system. Communicating with an out-of-process component is an order of magnitude slower than communicating with a local in-memory object. When you also factor in the time taken to send a call over a network or serialize a message to XML, the latency becomes a noticeable drag on performance.
ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton